How much improvement will I see?

I am a big fan of a higher stall speed. I run an 8" TC that flashes to 5000 rpm at the track but putt-putting around town, you would never know it was a high-stall piece. At the track, the trans temp is roughly 160 when I leave the line and 180-185 at the end of the 1/4 mile. IIRC, the last time I calculated the slip at the stripe it was 5% or less.

I also agree with the others that your engine seems to be capable of high 12's/13 flat based on that mph. You just need to get hoofing getting out of the hole and a higher stall speed, coupled with that 4.30 gear, will do it.

So go as high a stall speed as you can. So long as it is a "tight" unit (meaning a small diameter for the stall speed, not a big diameter with a high stall speed), you'll never know it's a race piece.

Your comment on the squirter size put a smile on my face. Yep, too many people think they need a bigger pump shot when they really need a longer pump shot. A 50cc pump with maybe a 31 shooter and a good pump cam is a good place to start. You can also do this by filming over your carb and have someone stab the throttle (in Park!!). You can often see the stumble right after the pump shot ends.

My $.02...

BTW...good looking car!!